/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2006-2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard st, Cambridge MA, 02139 USA
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA 
   02110-1301 USA

*/

#include <igraph.h>

int main() {

  igraph_t g;
  igraph_vector_t v=IGRAPH_VECTOR_NULL;
  igraph_real_t edges[] = { 0,1, 1,2, 2,2, 2,3, 2,4, 3,4 };
  igraph_vector_t v2;
  long int i;
  igraph_vit_t vit;
  igraph_vs_t vs;
  igraph_integer_t size;

  igraph_vector_view(&v, edges, sizeof(edges)/sizeof(igraph_real_t));
  igraph_create(&g, &v, 0, IGRAPH_DIRECTED);

  /* Create iterator based on a vector (view) */
  igraph_vector_init(&v2, 6);
  VECTOR(v2)[0]=0;   VECTOR(v2)[1]=2;
  VECTOR(v2)[2]=4;   VECTOR(v2)[3]=0;
  VECTOR(v2)[4]=2;   VECTOR(v2)[5]=4;

  igraph_vit_create(&g, igraph_vss_vector(&v2), &vit);

  i=0;
  while (!IGRAPH_VIT_END(vit)) {
    if (IGRAPH_VIT_GET(vit) != VECTOR(v2)[i]) {
      return 1;
    }
    IGRAPH_VIT_NEXT(vit);
    i++;
  }
  if (i != igraph_vector_size(&v2)) {
    return 2;
  }

  igraph_vit_destroy(&vit);
  igraph_vector_destroy(&v2);

  /* Create small vector iterator */

  igraph_vs_vector_small(&vs, 0, 2, 4, 0, 2, 4, 2, -1);
  igraph_vit_create(&g, vs, &vit);
  igraph_vs_size(&g, &vs, &size);
  printf("%li ", (long int) size);
  for (; !IGRAPH_VIT_END(vit); IGRAPH_VIT_NEXT(vit)) {
    printf("%li ", (long int) IGRAPH_VIT_GET(vit));
  }
  printf("\n");
  
  igraph_vit_destroy(&vit);
  igraph_vs_destroy(&vs);

  /* Clean up */

  igraph_destroy(&g);

  return 0;
}
